EUS 202 Lecture Notes - Saltwater Intrusion, Ecosystem Services, Secondary Treatment
5 Sep 2013
School
Department
Course
Professor
Document Summary
Water is withdrawn upstream, removing half of the normal stream discharge=doubled concentration. New concentration poses higher potential to harm aquatic organisms and system. Conventional systems also use potentially hazardous chemicals in the treatment process & ^422 Often located in areas with very little power in the decision-making process. Storm+wastewater: a source of concern during heavy precipitation events and periods of rapid melting snow. During these events, volume becomes extremely high, stresses the capacity of the treatment plant and can cause overflow. Overflow means pollution directly released to surface waters without treatment. Reduce per capita water use=less domestic wastewater in the combined system lessens the potential for overflow. Reducing flow rates ensures water is detained longer during treatment=less water =longer retention times at plants. Coastal cities may have groundwater=vulnerable to saltwater intrusion. ^withdraws of freshwater reduces pressure that allows denser saltwater to migrate. Primary treatment: mechanical or physical separation (settling tanks)
